Posts treating: "microfossils"
Wednesday, 19 April 2017
There is a small potted tree upstairs on the bridge deck and an orchid plant that I sit next to just to see something green. We are a little less than a week in to this expedition and this has become my favorite place on the ship.
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Expedition 361's newest sediment cores brought up spectacular foraminifera – translucent, glassy and “very pretty” throughout the ocean
Comic by: Jesus Reolid
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When they have a core of deep sea sediments , the scientists have to make an age determination.
How might they determine sample's age?
There are a lot of microfossils in oceanic sediments and they provide a basis for age determination. The paleontologists studying sedimentary sequences have established first appearences and extinction of species through time.
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One thing all geologists want to know is the age of the rock they are looking at and the most common way of doing that is by looking at the fossil assemblage in the sediments. When working with a thin core from the bottom of the ocean as we do here we are obviously not likely to find a fossil horse or a dinosaur but instead we rely on microfossils that represent the ancient plankton of the ocean.
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As we get lower and lower in the section and closer and closer to our basement target the cores are more frequently filled with volcanic materials, effectively redeposited volcanic ashes that have cascaded downhill into the little basin we are drilling in.
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Two days ago we had the Chinese New Year. As cores have not arrived yet, we tried to keep our hands busy making Chinese dumplings. People say that you need to be patient to count microfossils, but dumplings for me are even more challenging! Thanks Xin-Su 'the dumpling master' and other Chinese scientists arranged everything and taught us how to make them.
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The National Museum of Natural History, Smithsonian Institution, is pleased to announce a postdoctoral fellowship to work on a project in collaboration with Dr. Gene Hunt in the Department of Paleobiology. This project, entitled Does Sexual Selection Promote Speciation and Extinction? A Test Using the Fossil Record of Ostracodes, combines morphometric measurement of sexual dimorphism in fossil ostracodes with analysis of stratigraphic ranges of taxa to test if sexual selection modulates [...]
“Remnants of fluvial sediments and their paleovalleys may map out a late Oligocene–early Miocene “super-river” from headwaters in the southern Colorado Plateau, through a proto–Grand Canyon to the Labrador Sea, where delta deposits contain microfossils that may have been derived from the southwestern United States.” Quoted from GSA Today article titled: Late Oligocene–early Miocene Grand
Late Oligocene–early Miocene Grand Canyon: A Canadian connection?
Authors:
James W. Sears
Abstract:
Remnants of fluvial sediments and their paleovalleys may map out a late Oligocene–early Miocene “super-river” from headwaters in the southern Colorado Plateau, through a proto–Grand Canyon to the Labrador Sea, where delta deposits contain microfossils that may have
Blowin' in the wind… 100 Ma old multi-staged dinoflagellate with sexual fusion trapped in amber: Marine–freshwater transition
Authors:
1. Edwige Masure (a)
2. Jean Dejax (b)
3. Gaël De Ploëg (c)
Affiliations:
a. Centre de Recherche sur la Paléobiodiversité et les Paléoenvironnements, CR2P UMR7207 – CNRS, MNHN, UPMC Univ. Paris 6, Université Pierre et Marie Curie, 75252 Paris Cedex
Organic-walled microfossils from the early Neoproterozoic Liulaobei Formation in the Huainan region of North China and their biostratigraphic significance
Authors:
1. Qing Tang (a, b)
2. Ke Pang (a, b)
3. Shuhai Xiao (b)
4. Xunlai Yuan (a)
5. Zhiji Ou (a)
6. Bin Wan (a)
Affiliations:
a. State Key Laboratory of Palaeobiology and Stratigraphy, Nanjing Institute of Geology
Terminal Proterozoic cyanobacterial blooms and phosphogenesis documented by the Doushantuo granular phosphorites I: In situ micro-analysis of textures and composition
Authors:
1. Zhenbing She (a, b)
2. Paul Strother (c)
3. Gregory McMahon (d)
4. Larry R. Nittler (e)
5. Jianhua Wang (e)
6. Jianhua Zhang (f)
7. Longkang Sang (a)
8. Changqian Ma (a, b)
9. Dominic Papineau (c,
After preparing the sediment samples so that the microfossils can be examined, the biostratigraphers examine to species to find important biostratigraphic markers that can tell us the age of the sediments. The radiolarians and the diatoms have been especially helpful for determining how old the sediments are.
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We are dancing with microfossils in microscopes under the strong swinging vessel JR in the low atmospheric pressure.
I get shipsick (microscopy sick in another name) again...
Itsuki
This post is about things forgotten, remembered, and made easy.On May 23, 2013, the Forest Service, part of the U.S. Department of Agriculture, issued proposed regulations to administer the Paleontological Resources Preservation (PRP) legislation of 2009 across the land it administers. Public comments in writing will be accepted until July 22, 2013. Last things first - the public commenting is what's been made easy. I've never felt strongly enough before about [...]
Spindle-shaped inclusions in 3 billion-year-old rocks are microfossils of plankton that probably inhabited the oceans around the globe during that time, according to an international team of researchers.
"It is surprising to have large, potentially complex fossils that far back," said Christopher H. House, professor of geosciences, Penn State, and lead author.
However, the researchers
Microstructures in metasedimentary rocks from the Neoproterozoic Bonahaven Formation, Scotland: Microconcretions, impact spherules, or microfossils?
Authors:
1. Ross P. Anderson (a)
2. Ian J. Fairchild (b)
3. Nicholas J. Tosca (c)
4. Andrew H. Knoll (d)
Affiliations:
a. Department of Earth and Planetary Sciences, Harvard University, 20 Oxford Street, Cambridge, MA
FTIR microspectroscopy of Ediacaran phosphatized microfossils from the Doushantuo Formation, Weng’an, South China
Authors:
1. Motoko Igisu (a, b)
2. Tsuyoshi Komiya (a)
3. Mika Kawashima (c)
4. Satoru Nakashima (c)
5. Yuichiro Ueno (d, e)
6. Jian Han (f)
7. Degan Shu (f)
8. Yong Li (g)
9. Junfeng Guo (g)
10. Shigenori Maruyama (d, e)
11. Ken Takai (b, e, h)
Affiliations:
I’ve been playing Airport Scanner, a iPhone game app which casts the user in the role of a TSA agent monitoring an airport X-ray machine. Streaming through the machine are various pieces of luggage (and the occasional fish). In some of the bags, hidden amid distracting clothes and electronics, are forbidden items, such as guns, machetes, bullets, bombs, crossbows, and bottles of wine. At the stage I’ve reached in the game, some bags have no illicit items, some have just one, and a few have [...]